The gauge (thickness) of stamped steel for glider frames is more than adequate. The galvanized surface is as smooth as stainless steel. I don't see any flaws on either the inner or outer rail. Pre-lubricated ball bearings in the housing run smoothly. The bearing clearance is ideal from one end of the rails to the other. There is no binding or excessive play due to too little or too much bearing play. These sliders are perfect for a 20" drawer.
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